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#include <string>
#include <vector>

using namespace std;
vector<char> charVec;

bool checkSkip(char c, string skip) {
    bool isinclude = false;
    for (int i = 0; i < skip.size(); i++){
        if (c == skip[i])
            isinclude = true;
    }
    return isinclude;
}

char replaceChar(char c, int index) {
    char result;
    int cIdx = 0;
    for (int i = 0; i < charVec.size(); i++) {
        if (c == charVec[i]) {
            cIdx = i;
            break;
        }
    }

    result = cIdx + index;
    if (result >= charVec.size())
        result -= charVec.size(); 

    // printf("char: %c, rep: %c, char index : %d,  rep index : %d\n", c, charVec[result], cIdx, result);
    return charVec[result];
}

string solution(string s, string skip, int index) {
    string answer = "";
    for (char c = 'a'; c <= 'z'; c++) {
        if (!checkSkip(c, skip))
            charVec.push_back(c);
    }
    for (int i = 0; i < s.size(); i++) {        
        if (!checkSkip(s[i], skip)) {
            answer += replaceChar(s[i], index);
        }
        else {
            answer += s[i];
        }
    }

    printf("%s", answer.c_str());

    return answer;
}